CN117031377B - Automatic calibration system and method for Hall type current sensor - Google Patents
Automatic calibration system and method for Hall type current sensor Download PDFInfo
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- CN117031377B CN117031377B CN202311007442.4A CN202311007442A CN117031377B CN 117031377 B CN117031377 B CN 117031377B CN 202311007442 A CN202311007442 A CN 202311007442A CN 117031377 B CN117031377 B CN 117031377B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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Abstract
An automatic calibration system and method for a hall type current sensor, comprising: acquiring a current frequency signal and a satellite time frequency signal of a current sensor at a calibration position; obtaining a time difference between the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal based on the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal; acquiring a current frequency signal and a satellite time frequency signal of a conversion module in a remote laboratory; obtaining a time difference between the current frequency signal of the conversion module in the remote laboratory and the satellite time frequency signal based on the current frequency signal of the conversion module in the remote laboratory and the satellite time frequency signal; obtaining a time deviation based on the difference between the time differences at the calibration site and the remote laboratory; and repeating the calibration steps to obtain average relative frequency deviation, and then calculating average relative current deviation according to the average relative frequency deviation. The precision of the sensor is ensured, and the service life of the current sensor is prolonged.
Description
Technical Field
The invention belongs to the field of electrical metering calibration, and particularly relates to an automatic calibration system and method of a Hall type current sensor.
Background
In recent years, with the development of computer technology and smart grids, higher requirements are being put on the accuracy of various parameters of the power system. The current is an important parameter in the power system, and the accurate acquisition of the data is an important ring in the power monitoring system.
The current sensor for measuring current data in the current power system mainly comprises a Hall current sensor, a magnetic current sensor, a resistance type current sensor and the like. Which can convert the current into a measurable signal. The current sensor is mainly applied to the fields of power systems, industrial automation and the like, and is used for monitoring the change of current and ensuring the safe operation of the power systems.
The current sensor is used as a device capable of quantitatively detecting current information, and under the influence of various factors such as ambient temperature, device aging, magnetic field interference and the like, various errors which are difficult to avoid are very worthy of research, and how to ensure the accuracy and the stability under long-time working is a very worthy problem. Generally, ensuring the accuracy of a metering device is accomplished primarily by periodic calibration. The calibration mode mainly comprises traditional calibration and remote calibration. The traditional calibration generally comprises the steps of sending a metering device to be calibrated to a primary standard calibration laboratory, placing the standard and the metering device to be calibrated in the same space, measuring the same physical quantity, comparing the measurement data of the standard and the metering device to be calibrated, calculating errors, and calibrating the metering device to be calibrated. The remote calibration standard developed in recent years is to send the standard to a production site through a physical distribution mode or the like, and calibrate the metering device to be calibrated. Because the personnel of the metering department are limited, the verification period time is long, and a large amount of manpower, material resources and financial resources are consumed in the two modes, so that a large amount of inconvenience [7] is brought to enterprises and the like. In addition, in the traditional calibration process, the power system is stopped, the factory is stopped, and the like, the calibration period is long, and the extra production cost is increased intangibly. In recent years, along with the development of remote calibration concepts, various technologies in the remote calibration field are gradually perfected, a novel calibration mode for calibrating by taking time frequency on a satellite as a medium is gradually developed, which is called a satellite common view calibration method, so that partial instruments and meters can be calibrated in a mode of connecting a remote calibration department through the satellite and a network in a working place, calibration certificates and the like can be provided, a large amount of time is saved, the production efficiency is greatly improved, and various resource costs are saved.
Disclosure of Invention
The invention aims to provide an automatic calibration system and method for a Hall type current sensor, which are used for realizing the remote calibration of the Hall type current sensor and a standard under different spaces by remotely connecting a calibration laboratory and a satellite through a network and a satellite receiving module when the calibration is needed, so as to help solve the problem that the Hall type current sensor needs to be calibrated regularly. The Hall type current sensor has longer maintenance period, higher stability and accuracy, and is more suitable for current monitoring in various environments such as a power system and the like.
The technical scheme of the invention is as follows:
an automatic calibration method of a hall current sensor, the method comprising:
Acquiring a current frequency signal and a satellite time frequency signal of a current sensor at a calibration position;
Obtaining a time difference between the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal based on the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal;
acquiring a current frequency signal and a satellite time frequency signal of a conversion module in a remote laboratory;
obtaining a time difference between the current frequency signal of the conversion module in the remote laboratory and the satellite time frequency signal based on the current frequency signal of the conversion module in the remote laboratory and the satellite time frequency signal;
obtaining a time deviation based on the difference between the time differences at the calibration site and the remote laboratory;
Obtaining a frequency deviation based on the time deviation;
and repeating the calibration steps, calculating the average relative frequency deviation of multiple calibrations, and calculating the average relative current deviation according to the average relative frequency deviation, wherein the average relative current deviation is the error value of the Hall type current sensor.
Further, the current frequency signal of the remote laboratory conversion module is obtained based on the current frequency signal of the calibration end current sensor.
Further, a formula for obtaining a time difference between the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal based on the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal is as follows:
Δt1＝t2-t1
In the formula, a satellite time frequency signal of a remote laboratory is taken as a door opening signal t 1, and a current frequency signal transferred and output by the conversion module is taken as a door closing signal t 2.
Further, a formula for obtaining a time difference between the current frequency signal of the precision conversion module and the satellite time frequency signal in the remote laboratory based on the current frequency signal of the conversion module in the remote laboratory and the satellite time frequency signal is as follows:
In the formula, T 0 is the indication value displayed on the satellite time frequency signal access counter 0, T 1 is the indication value displayed on the current frequency signal access counter 1, the satellite time frequency signal received by the laboratory is equal to the satellite time frequency signal received by the calibration site, and T 1,t3 is the current frequency signal of the precision conversion module in the remote laboratory.
Further, the time deviation formula obtained by making a difference based on the time difference between the calibration place and the remote laboratory is as follows:
Δt＝Δt1-Δt2
Δt 1 is the time difference between the current frequency signal of the current sensor at the calibration and the satellite time frequency signal, and Δt 2 is the time difference between the current frequency signal of the precision conversion module and the satellite time frequency signal in the remote laboratory.
Further, the formula for obtaining the frequency deviation based on the time deviation is as follows:
Δt is the time offset based on the difference between the time at the calibration and the remote laboratory.
Further, the formula for averaging the relative current deviation from the average relative frequency deviation is:
k is the conversion coefficient of the high-precision current frequency conversion module.
The invention also provides an automatic calibration system of the Hall type current sensor, which comprises:
A calibration site and a remote laboratory connected to the calibration site;
The laboratory end includes: the system comprises a computer, a standard current source, a high-precision current-frequency conversion module and a time interval counter which are sequentially connected, wherein the time interval counter is also connected with a signal receiving module, and the signal receiving module is also connected with a satellite;
The calibration part comprises a power supply, a Hall type current sensor and a satellite which are sequentially connected.
Further, the hall type current sensor includes: the system comprises a singlechip module, a power supply module, a signal receiving module, a Hall working device, an adjustable current source, a high-precision current-frequency conversion module, an offset, a temperature compensation circuit and a display module; the power supply module, the signal receiving module and the display module are connected with the singlechip; the power supply module, the Hall working device and the offset are connected with the temperature compensation circuit and the singlechip; the adjustable current source, the high-precision current-frequency conversion module and the singlechip are sequentially connected; the adjustable current source is connected with the Hall working device.
Further, the singlechip module includes: the single chip microcomputer cpu, the counter T0, the counter T 1 and the parallel IO; the singlechip cpu, the counter T0 and the counter T 1 are respectively connected with the parallel IO interfaces.
The invention has the technical effects that:
The invention can avoid the trouble of periodic calibration of the current sensor and save time and cost. In addition, the self-calibration module uses the time signal of the satellite and the time frequency of the satellite atomic clock as a transmission medium, and can complete remote automatic calibration under the short operation of limited personnel in the field and a laboratory. The linear error caused by aging of the electronic device under the long-time use of the Hall sensor is effectively reduced, the accuracy of the sensor is ensured, the burden of maintenance personnel is lightened, and the service life of the current sensor is prolonged.
Drawings
The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the inventive embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.
FIG. 1 shows a schematic diagram of a self-calibrating system of the present invention;
FIG. 2 shows a schematic diagram of a self-calibrating system of the present invention;
FIG. 3 shows a flow diagram of a single chip microcomputer of the present invention;
FIG. 4 shows a schematic flow diagram of a remote laboratory computer of the present invention;
Fig. 5 shows a schematic diagram of the hall device configuration of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-5, an embodiment of the present invention provides an automatic calibration system and method for a hall current sensor
The method comprises the following steps:
after receiving the calibration task, the calibration site calibrator and the remote laboratory calibrator prepare for calibration and wait for a calibration command. After the calibration command is sent, the calibration field personnel operate the Hall type current sensor to start up and adjust the Hall type current sensor into a calibration state.
At this time, the singlechip accesses the control circuit into the calibration module from the working state, and then, the current sensor singlechip sends an adjusting command to the current source. After the adjustment command is issued, the current source at the calibration site will randomly draw a current that is unknown until calibration is complete, i.e., unknown to both the calibration site and the remote laboratory.
The hall device then collects this current signal and finally displays a current indication. This current indication is remotely transmitted to a remote laboratory. The remote laboratory computer receives the indication value, controls the standard current source to output the indication value, and the laboratory calibrator checks whether the indication value is correct or not, and if the indication value is correct, the calibration is continued, and if the indication value is incorrect, the calibration is failed, and the next calibration is ready. After the current source outputs the current, the time difference between the current frequency and the time frequency is calculated by the counter, and the difference is transmitted to the calibration field singlechip.
And after calculating the time difference between the current frequency of the current output by the current source and the satellite time frequency, the calibration field singlechip continuously performs the difference between the current frequency of the current output by the current source and the satellite time frequency to obtain the time deviation. The corresponding current error is calculated and recorded from this time offset and this error is transmitted to a remote laboratory for recording.
And repeating the calibration steps to obtain the average relative frequency deviation of multiple calibrations. And then the average relative frequency deviation is used for calculating the average relative current deviation, namely the current error. After the current error is obtained, the current error is stored in a single chip microcomputer register, and the value compensation sensor is called to display the number when the sensor measures each time.
And checking the calibration operation steps by the calibration site personnel and the remote laboratory personnel, and ending the calibration after the calibration result is confirmed to be correct.
The satellite signal receiver should ensure low latency and reduce errors introduced by the receiver. The high precision current-to-frequency conversion module should have a relatively accurate conversion factor over long periods of use, minimizing errors introduced by the calibration site not being synchronized with the remote laboratory conversion factor. The parameters of the current sensor, such as Hall coefficient, temperature error compensation parameter and the like, are accurate, so that errors caused by factory control of the sensor are reduced. When the current sensor is installed, the current sensor is installed strictly according to the instruction, so that potential safety hazards and errors caused by personnel operation are reduced.
Working principle: hall current sensors operate using the hall effect. The hall effect is an electromagnetic effect found by the united states physicist e.h.hall doctor in 1879. The rectangular thin plate in the figures is a hall device, typically a semiconductor material. Current I is introduced into the two contact holes a and b, carriers are uniformly distributed in the semiconductor when no external magnetic field is applied, and no voltage difference exists between the two contact holes c and d; when a magnetic field perpendicular to the semiconductor surface is applied, carriers deflect and accumulate due to the lorentz force, and finally a stable voltage difference, called hall voltage, is generated between the c and d contact holes.
The high-precision current frequency conversion module acquires and converts input current signals into corresponding voltage signals, amplifies the voltage signals and improves signal amplitude. And converting the converted analog voltage signal into a digital signal, performing frequency calculation, and then filtering and noise reduction to output a current frequency signal.
The current output by the current source is I 0, the converted frequency is f 0, and when the conversion coefficient is K, the current is as follows
f0＝KI0 (1-1)
The remote laboratory takes the time-frequency signal received by the receiver as a door-opening signal t 1, takes the waveform string converted by the conversion module as a door-closing signal t 2, and the time difference between the two signals
Δt1＝t2-t1 (1-2)
Let the indication value displayed by the time-frequency accessed counter 0 in the singlechip be T 0, and the indication value displayed by the current-frequency accessed counter 1 be T 1. Because the two counters start to work simultaneously, the time spent on the values is equal, and because the time pulse frequency of the satellite is 1s, the time frequency signal received by the remote laboratory is equal to the time frequency signal received by the calibration site and is t 1, the output waveform string of the current frequency conversion module of the calibration site is t 3, and the time difference of the remote laboratory is
It can be seen that the remote laboratory and calibration site time bias is
Δt＝Δt1-Δt2 (1-4)
After multiple measurements, a series of Δt can be obtained, from which the average relative frequency deviation of the remote laboratory from the calibration site over a period of time can be calculated.
Wherein f 1,f2 is the frequency signal converted by the current of the calibration laboratory end and the calibrated field end, τ is the average time interval, and f is the standard time frequency signal of the satellite.
And then the average relative frequency deviation is used for calculating the average relative current deviation, wherein the average relative current deviation is the error value of the Hall type current sensor.
K is the conversion coefficient of the high-precision current frequency conversion module.
The embodiment of the invention also provides an automatic calibration system of the Hall type current sensor, which comprises:
A calibration site and a remote laboratory connected to the calibration site;
The laboratory end includes: the system comprises a computer, a standard current source, a high-precision current-frequency conversion module and a time interval counter which are sequentially connected, wherein the time interval counter is also connected with a signal receiving module, and the signal receiving module is also connected with a satellite;
The calibration part comprises a power supply, a Hall type current sensor and a satellite which are sequentially connected.
The hall type current sensor includes: the system comprises a singlechip module, a power supply module, a signal receiving module, a Hall working device, an adjustable current source, a high-precision current-frequency conversion module, an offset, a temperature compensation circuit and a display module; the power supply module, the signal receiving module and the display module are connected with the singlechip; the power supply module, the Hall working device and the offset are connected with the temperature compensation circuit and the singlechip; the adjustable current source, the high-precision current-frequency conversion module and the singlechip are sequentially connected; the adjustable current source is connected with the Hall working device.
The singlechip module comprises: the system comprises a singlechip cpu, a counter T0, a counter T1 and parallel IO; the singlechip cpu, the counter T0 and the counter T1 are respectively connected with the parallel IO interfaces.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. An automatic calibration method for a hall current sensor, the method comprising:
The current source on the calibration site randomly calls out a current, the Hall working device acquires the current signal, finally displays a current indication value, the current indication value is remotely transmitted to a remote laboratory, and a remote laboratory computer receives the indication value and controls the standard current source to output the current indication value;
Obtaining a current frequency signal and a satellite time frequency signal output by a current source at a calibration position through a high-precision current frequency conversion module at the calibration position;
Obtaining a time difference between the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal based on the current frequency signal of the current sensor at the calibration position and the satellite time frequency signal;
acquiring a current frequency signal and a satellite time frequency signal output by a standard current source in a remote laboratory through a remote high-precision current frequency conversion module;
Obtaining a time difference between the current frequency signal of the remote laboratory conversion module and the satellite time frequency signal based on the current frequency signal of the remote laboratory conversion module and the satellite time frequency signal;
Obtaining a time deviation based on the time difference between the calibration place and the remote laboratory;
Obtaining a frequency deviation based on the time deviation;
Then repeating the calibration steps to obtain the average relative frequency deviation of multiple calibrations, and then obtaining the average relative current deviation according to the average relative frequency deviation, wherein the average relative current deviation is the error value of the Hall type current sensor;
The formula for averaging the relative current bias with the average relative frequency bias is:
k is the conversion coefficient of the high-precision current frequency conversion module.
2. The method of claim 1, wherein the current frequency signal of the remote laboratory conversion module is derived based on the current frequency signal of the calibration side current sensor.
3. The automatic calibration method of a hall type current sensor according to claim 1, wherein the formula for obtaining the time difference between the current frequency signal of the current sensor at the calibration and the satellite time frequency signal based on the current frequency signal of the current sensor at the calibration and the satellite time frequency signal is:
Δt1＝t2-t1
In the formula, a satellite time frequency signal of a remote laboratory is taken as a door opening signal t 1, and a current frequency signal transferred and output by the conversion module is taken as a door closing signal t 2.
4. The automatic calibration method of a hall type current sensor according to claim 1, wherein the formula for obtaining the time difference between the current frequency signal of the accuracy conversion module and the satellite time frequency signal in the remote laboratory based on the current frequency signal of the conversion module in the remote laboratory and the satellite time frequency signal is:
In the formula, T 0 is the indication value displayed on the satellite time frequency signal access counter 0, T 1 is the indication value displayed on the current frequency signal access counter 1, the satellite time frequency signal received by the laboratory is equal to the satellite time frequency signal received by the calibration site, and T 1,t3 is the current frequency signal of the precision conversion module in the remote laboratory.
5. The method of automatic calibration of a hall current sensor according to claim 1, wherein the time offset formula is derived by taking the difference based on the time difference between the calibration site and the remote laboratory:
Δt＝Δt1-Δt2
Δt 1 is the time difference between the current frequency signal of the current sensor at the calibration and the satellite time frequency signal, and Δt 2 is the time difference between the current frequency signal of the precision conversion module and the satellite time frequency signal in the remote laboratory.
6. The automatic calibration method of a hall current sensor according to claim 1, wherein the formula for obtaining the frequency deviation based on the time deviation is:
Δt is the time offset based on the difference between the time at the calibration and the remote laboratory.
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